TERMINALS OF ECU 1. CHECK AIR CONDITIONING AMPLIFIER
(a) Disconnect the J19 air conditioning amplifier connector. (b) Measure the resistance and voltage according to the value(s) in the table below.
(c) Reconnect the J19 air conditioning amplifier connector. (d) Measure the voltage according to the value(s) in the table below.
2. CHECK AIR CONDITIONING CONTROL ASSEMBLY
(a) Disconnect the J127 air conditioning control assembly connector. (b) Measure the voltage and resistance according to the value(s) in the table below.
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Toyota Tundra Service Manual > Air Conditioning System(for Automatic Air Conditioning System): Blower Motor Circuit
DESCRIPTION The blower motor is operated by signals from the air conditioning amplifier. Blower motor speed signals are transmitted by changes in the duty ratio. Duty Ratio: The duty ratio is the ratio of the blower motor OFF time (B) to the total of the blower motor ON and OFF time (A + B). The blo ...